Snap - revolutionnary product?

Snap claims to have found a way to get CAP (Cost Per Acquisition) working. Have they?

A new way to rank.
Snap is taking user selection to the next level. While paid results on the majors are currently self-regulated by click activity -- either with minimum click through rates, click popularity or a combination of both -- Snap uses actual conversion or desired activity information to help rank results. In other words, simply clicking into a site just won’t do it: the searcher has to buy something in order to climb the ranks.

What does it mean?
It just mean that you'll need to make sure that you sell something to your visitor to stand a chance to clinmb the ranking ladder. Well... it just means that you jsut need to get the visitor to click on a link of your page (you then stick the Snap tracker in, and the action is then considered as a sale!). snap must have thought about that - I'll give it a try to see if I miss something here.